MCQ On Biomolecule Class-12 » Chemistry-Papers

Guanine is an example of

a nucleotide

a nitrogenous base

a nucleoside

The pair of compounds in which both the compounds give positive test with Tollen’s reagent is

fructose and sucrose

glucose and sucrose

glucose and fructose

Which of the following statements is not correct?

In alpha-amino acids, - NH2 and – COOH groups are attached to different carbon atoms.

Natural proteins are commonly made up of L-isomer of amino acids (D) In -amino acids, - NH2 and

Except glycine, all other amino acids show optical activity

Which of the following vitamins is water soluble?

Vitamin E

Vitamin D

Riboflavin

Deficiency of vitamin E causes

Sterility Anaemia

Muscular weakness

Scurvy

Reduction of hexose A (molecular formula C6H12O6) with sodium borohydride gives compound B and C. Compound B is optically inactive, whereas compound C is optically active . Which of the following is compound A?

D-glucose

D-fructose

D-mannose

D-galactose

Molisch’s test reagent is

1% of β-Napthol in alcohol

both

5% solution of α-Napthol in alcohol and few droplets of conc. H2SO4

Carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone.

Monosaccharide

Polysaccharide

Oligosaccharide

Identify the pair of epimers

D-glucose and L-glucose

D-glucose and D-mannose

D-glucose and D-fructose

D-glucose and D-mannose

Proteins are the polymers of -amino acids and they are connected to each other by ------

ionic bond

coordinate bond

peptide bond

Biuret test is used for

Proteins

Fats

Sugar

The two monosaccharide units obtained on hydrolysis of disaccharide may be

both

same

different

Select the base which is not common in DNA and RNA.

Uracil (U)

Guanine (B)

Cytosine (C)

Adenine (A)

In iodine test of starch which colour of ppt had been observed

blue

red

black

D-Glucose and L-Glucose are

enantiomers

diastereomers

epimers

anomers

Which of the following bases is not present in RNA?

Thymine

Adenine

Cytosine

Fehling’s solution test is given by

glucose

lactose

fructose

all of these

Carbohydrates have

> C = O group

–OH group

–CHO group

All

What will be the sequence of complimentary strand of DNA if the one strand of DNA has the sequence of TATGACTG?

ATACTGCA

ATACTGAC

ATACACTC

Find out the correct option among the following statements.

Fehling’s solution and Tollen’s reagent are non-reducing sugar

All monosaccharides whether aldoses or ketoses are reducing sugar

In reducing sugars, aldehydic and ketone group are free bonded

Maltose and lactose are non-reducing sugar

Phosphodiester linkage is present between which carbon atoms of pentose sugars of nucleotides?

5’ and 3’

1’ and 5’

5’ and 5’

3’ and 3’

Deficiency of biotin causes dermatitis and paralysis, biotin is also known as

vitamin H

vitamin D

vitamin B12

Glucose cannot be classified as ?

Hexose

Carbohydrate

Oligosaccharide

Aldose

Fructose reduce Tollen’s reagent due to

primary alcoholic group

enolisation of fructose followed by conversion of aldehyde by base

secondary alcoholic group

How many amino acids (approximately) are involved during the synthesis of protein?

Which one of the following is non-reducing sugar?

Maltose

Fructose

Sucrose

Glucose

Which carbohydrate is used in silvering of mirror?

(B) Fructose

(A) Sucrose

(D) B and C

How many number of water molecules are removed from the n number of amino acids during the formation of peptide bond?

(n – 2)

(n – 3)

(n – 1)

Millon’s test is given by

ester

Proteins

Sucrose

Which is a fat soluble vitamin?

Vitamin C

Vitamin A

Vitamin B6

Vitamin C must be supplied regularly in diet because

it is fat soluble hence stored in the body and cannot be used on regular basis

it is water soluble hence excreted in urine and can’t be stored in the body

it is water soluble hence used by the body on daily basis and is to be supplied regularly

Which one of the following is reducing sugar?

Glycogen

Fructose

Starch

Cellulose

Vitamin A is present in-